Add number of days challenge

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Jessica Kwok 2021-06-03 10:15:05 -07:00
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## Other
* [Fisher Yates](https://github.com/TheAlgorithms/Ruby/blob/master/other/fisher_yates.rb)
* [Number of Days](https://github.com/TheAlgorithms/Ruby/blob/master/other/number_of_days.rb)
## Project Euler
* Problem 1

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other/number_of_days.rb Normal file
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# Challenge name: Number of Days Between Two Dates
#
# Write a program to count the number of days between two dates.
#
# The two dates are given as strings, their format is YYYY-MM-DD as shown in the examples.
# Example 1:
# Input: date1 = "2019-06-29", date2 = "2019-06-30"
# Output: 1
#
# Example 2:
# Input: date1 = "2020-01-15", date2 = "2019-12-31"
# Output: 15
#
# Constraints: The given dates are valid dates between the years 1971 and 2100.